Question
Brandon and Henry take 4 days to assemble a toy train. Henry and Jack take 4 days to build the same train while Brandon and Jack take only 5 days. How many complete days would the three of them take to build the same toy train?
4 m

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Brandon and Henry take 4 days to assemble a toy train. Henry and Jack take 4 days to build the same train while Brandon and Jack take only 5 days. How many complete days would the three of them take to build the same toy train?